I'm currently running a Zombie Reloaded CSS server and we are starting to have problems with zombies blocking paths either because they're AFK or because they are protecting humans from being killed.
I have seen a few plugins that remove PvP collisions, but they do that permanently which isn't desired. If PvP collisions are permanently disabled, zombies wouldn't be able to stack (neither would humans) to boost each other to higher spots and would likely clear out the server.
The one that I did find that was similar to what I want wasn't a SM or MM plugin which would make it a pain in the ass to use on the server.
So basically what I want is a plugin where a player can type !zblock or something along those lines and have them not collide with other players for a set amount of time (5 or 10 seconds).